Tetragoniceps bermudensis, Mussini & Niimi & Khodami & Kihara & Martinez Arbizu & Blanco-Bercial, 2025
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publication ID |
https://doi.org/10.3897/zookeys.1239.144436 |
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publication LSID |
lsid:zoobank.org:pub:18CF154B-12AF-49B5-A964-F85F728B6436 |
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DOI |
https://doi.org/10.5281/zenodo.15476601 |
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persistent identifier |
https://treatment.plazi.org/id/90289239-F1DC-56D1-8E37-B2CB5B9154D9 |
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treatment provided by |
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scientific name |
Tetragoniceps bermudensis |
| status |
sp. nov. |
Tetragoniceps bermudensis sp. nov.
Type locality.
Bermuda, Roadside Cave GoogleMaps (32.3468, -64.7131).
Type material.
Holotype, ovigerous female bearing egg sac. National Museum of Natural History ( USNM 1752730 About USNM ). GoogleMaps
Etymology.
The specific name bermudensis refers to the place where the new species was found followed by the Latin suffix - ensis, i. e. living in, or coming from, Bermuda. It is an adjective in the nominative singular.
Diagnosis.
A Tetragoniceps with caudal rami approximately 10 times longer than wide, P 5 with baseoendopodite and exopodite not fused into a single plate, cephalothorax with smooth dorsal surface, last segment of exopodites of P 2 to P 4 with 1 inner seta, endopodites of P 2 to P 4 with setal formula 1.021, and P 5 exopodite with 6 setae.
Description.
Female (Figs 3 View Figure 3 , 4 View Figure 4 ). Total body length from base of rostrum to end of caudal rami approximately 750 µm. Body slender, subcylindrical, with no demarcation between metasome and urosome (Fig. 3 View Figure 3 ), transparent when alive. Body surface smooth, with sensilla pattern as figured (Figs 3 A, B View Figure 3 , 4 View Figure 4 ). Body with 9 somites (prosome with cephalosome and P 1 - bearing somite fused, forming a cephalothorax, and with P 2 to P 4 bearing somites; urosome with P 5 - bearing somite, genital somite, 3 free urosomites, and anal somite with caudal rami). Posterior margin of body somites 4–8 with serrate hyaline frills.
Urosome (Figs 3 A – C View Figure 3 , 5 A, B View Figure 5 ) 5 - segmented, comprising P 5 - bearing somite, genital double-somite, 2 free abdominal somites, and anal somite. Genital field located medially, on anterior half of genital double-somite, with small median copulatory pore and paired genital pores laterally (Fig. 5 A View Figure 5 ). Anal operculum convex, with a row of fine spinules on distal margin (Fig. 5 B View Figure 5 ).
Caudal rami (Figs 3 A – C View Figure 3 , 5 B, C View Figure 5 ) approximately 10 times as long as wide at the widest portion (proximal end). Each ramus with 6 setae. Seta I completely reduced. Seta II laterally within the proximal half of each ramus. Seta III of similar length as seta II and located laterally within the terminal 20 % of each ramus. Dorsal seta VII longer than seta V, multi-articulated. Setae IV – VI arising apically, with IV and VI reduced in size and <30 % the length of seta V.
Rostrum (Fig. 6 A View Figure 6 ) rounded, symmetrical, and distally concave; it bears 2 sensilla located near the outer margin.
Antennule (Fig. 6 A View Figure 6 ) 9 - segmented. First segment elongate, with dentiform projection at outer distal corner. Aesthetascs on fourth and ninth segment. Armature formula 1 - [1], 2 - [8], 3 - [8], 4 - [2 + ae], 5 - [1], 6 - [3], 7 - [2], 8 - [1], 9 - [4 + ae].
Antenna (Fig. 6 B View Figure 6 ) with small, rectangular coxa and with long basis. Exopodite 1 - segmented, with 2 long bipinnate setae apically and 1 shorter unipinnate seta laterally. Endopod 2 - segmented. First endopodal segment unarmed. Second endopodal segment armed with 8 geniculate setae arising apically, the outer of which is basally fused with a slender seta, and armed with a small spinule on inner margin.
Mandible (Fig. 7 A View Figure 7 ) with large sclerotised gnathobase. Pars incisiva with several acute teeth and several accessory spinules and dentations. Basis with 3 setae. Exopod short, 1 - segmented, with 1 small outer seta and 2 terminal setae. Endopod 1 - segmented, with 1 lateral and 5 terminal setae.
Maxillule (Fig. 7 B View Figure 7 ) with praecoxa with arthrite armed with 6 distal spines, 2 bare terminal setae, and 1 subterminal bare seta. Coxal endite with 2 bare and 3 bipinnate terminal setae. Coxal epipodite represented by 1 bare seta. Basis with 4 bare, 1 unipinnate, and 2 geniculate terminal setae. Endopodite absent. Exopodite with 1 simple and 2 bipennate setae, and a row of long inner setules.
Maxilla (Fig. 7 C View Figure 7 ), syncoxa with 3 endites, the first (proximal) bilobed, proximal lobe with two, distal lobe very reduced and armed with 1 seta. Second endite with 1 unipinnate and 1 bare seta. Third endite with 1 unipinnate and 2 bare setae, one shorter than the others. Allobasis with a claw-like spine, 1 long unipinnate seta, 1 long bare seta, and 2 short bare setae. Endopodite 1 - segmented, with 6 terminal setae.
Maxilliped (Fig. 7 D View Figure 7 ) subchelate. Syncoxa with 2 pinnate setae distally. Basis showing the following proximo-distally: a row of several spinules, a long spine, a long seta, and a distal spinule. Endopodite 2 - segmented, second segment with 1 terminal claw, 1 terminal unipinnate seta, and 1 subterminal bare seta.
P 1 (Fig. 8 A View Figure 8 ) coxa bare, basis with 1 bare outer seta. Endopodite 2 - segmented, exopodite 3 - segmented. First endopodal segment with outer setules, and 1 large inner bipinnate seta. Second endopodal segment with outer setules, and 2 geniculate unipinnate setae distally. First and second exopodal segments with 1 outer spine; first segment without, second segment with inner and outer setules. Third exopodal segment with 1 outer spine, 2 geniculate setae and 1 unipinnate seta distally, and both inner and outer margin setules. Setal formula listed in Table 1 View Table 1 .
P 2 (Fig. 8 B View Figure 8 ) coxa bare, basis with 1 bare outer seta and armed with 2 short spinules surrounding the endopodite. Endopodite 2 - segmented, exopodite 3 - segmented. First endopodal segment with 1 large inner seta. Second endopodal segment with inner setules, 1 outer spine and 2 bipinnate setae distally. First exopodal segment with a distal spinose outgrowth, 1 large outer spine, and an outer spinule. Second exopodal segment with a distal spinose outgrowth, 1 large outer spine, 1 pinnate inner seta, and a row of outer margin spinules. Third exopodal segment with 3 outer spines, 1 pinnate inner seta, 1 outer apical spine, 2 distal bipinnate setae, and rows of both inner and outer margin spinules. Setal formula listed in Table 1 View Table 1 .
P 3 (Fig. 8 C View Figure 8 ) coxa bare, basis with 1 bare outer seta. Endopodite 2 - segmented, exopodite 3 - segmented. First endopodal segment with 1 large inner seta. Second endopodal segment with 1 distal outer spine and 2 bipinnate setae distally. First exopodal segment with a distal spinose outgrowth and 1 large outer spine. Second exopodal segment with a distal spinose outgrowth and 1 large outer spine, 1 pinnate inner seta, and a row of outer spinules. Third exopodal segment with 3 large outer spines, 1 pinnate inner seta, 1 subapical bipinnate seta, 2 distal unipinnate setae, and a row of outer margin spinules. Setal formula listed in Table 1 View Table 1 .
P 4 (Fig. 8 D View Figure 8 ) coxa bare, basis with 1 bare outer seta and armed with short spinules surrounding the endopodite. Endopodite 2 - segmented, exopodite 3 - segmented. First endopodal segment with 1 inner unipinnate seta and short distal spinules. Second endopodal segment with 1 outer spine and 2 bipinnate setae distally. Exopodite approximately 3 times as long as the endopodite. First exopodal segment with a distal spinose outgrowth and 1 large outer spine. Second exopodal segment with a distal spinose outgrowth and 1 large outer spine, 1 pinnate inner seta, and rows of both inner and outer spinules. Third exopodal segment with 1 small outer spine, 1 unipinnate inner seta, 2 bare setae subapically, 3 unipinnate setae distally, and rows of both inner and outer spinules. Setal formula listed in Table 1 View Table 1 .
P 5 (Fig. 8 E View Figure 8 ), baseoendopodite very pronounced, armed with 1 outer basal seta; endopodal lobe with 1 long, bare seta apically and 1 small seta subapically, and with 3 setae on the inner margin. Exopodite pronounced, elongate, with 6 setae.
P 6 (Fig. 5 A View Figure 5 ) each with rudimentary lobe carrying 2 bare setae, fused to basal plate.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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