Procampylaspis jonesi, Petrescu, 2001

Petrescu, I., 2001, New deep-sea Nannastacidae (Crustacea, Cumacea) from the Eastern Pacifc collected by R. V.`Vema’, Journal of Natural History 35 (11), pp. 1657-1680 : 1660-1667

Procampylaspis jonesi n. sp.

( figures 3– 6 )

Material. HOLOTYPE female, 6.04 mm body length ( AMNH 18040 ), sta. V-17-7 ; PARATYPES: one male, 4.57 mm body length ( AM NH 18043 ), sta. V-17-5 ; one female ( AMNH 18052 ) , one female ( GANMNH Cum 153 ) , one immature male ( AMNH 18075 ), sta. V-17-4 (dissected) ; one immature male ( AMNH 18045 ), sta. V-17-5 ; one immature male ( AMNH 18048 ) , one immature male ( GANMN H Cum 154 ), sta. V-17-7 .

Type locality. 40 ° 32 ' S, 75 ° 08 ' W, 3089–3279 m depth, SE Pacific Ocean , collected by R.V. ‘Vema,’ 22 M arch 1961.

Etymology. This species is dedicated to the memory of the late Norman S. Jones (1915–1997), fi ne scholar, teacher, person, one of the best-known authorities on the order Cumacea , and who described many species of Procampylaspis .

Description of female (figures 3, 4). Integument glabrous. Carapace (figure 3A) with very short ocular lobe, with small serration on antero-lateral corner. Antenna 1 (figure 3B) as usual for the genus. Labium as in figure 3C. Mandible (figure 3D) pars incisiva with four teeth; lacinia mobilis with three teeth; fi ve strong serrate setae between lacinia mobilis and thin truncate pars molaris. Maxilla 1 (figure 3F) outer endite with nine serrated setae and two smaller simple ones; palp with two fi laments, longer one with proximally directed setules on proximal half. Maxilla 2 (figure 3E) acuminated protopod with few fi ne setae on inner margin; endites with few simple and setulated apical setae. M axilliped 1 (figure 4A) endite of basis with an acuminate seta, plumose setae and a pair of retinacula; carpus long with four simple fl attened setae on inner margin and few simple and plumose setae; dactylus acuminate. Maxilliped 2 (figures 4B,C) propodus twice as long as carpus, with two setules on inner distal corner; tooth 5 of dactylus longer than 3, tooth 4 half as long as 3, with a small seta; limit between tooth 2 and 1 well marked, fi rst tooth as long as 3. M axilliped 3 (figure 4D) basis shorter than half of maxilliped, without outer process; merus with strong inner tooth and another on outer margin; carpus with two outer teeth; dactylus with four terminal setae. Pereopod 1 (figure 4E) basis shorter than half of pereopod; ischium longer than merus; carpus shorter than propodus; propodus longer than dactylus; dactylus with few short terminal setae. Pereopod 2 (figure 4F) basis shorter than half of pereopod; carpus twice as long as merus, with robust seta on inner distal corner; dactylus long, more than three times as long as propod us, with few setae. Exopod s on maxilliped 3 and pereopods 1 and 2. Pereopod 3 (figure 4G) basis much longer than half of pereopod, two plumose setae on outer margin. Pereopods 4 and 5 (figure 4H,I) with progressively shorter bases and longer carpus compared to third pair. Uropod (figures 4J,K) with peduncle twice as long as last pleonite, 1.5 times as long as endopod, few simple setae on inner margin; exopod shorter than endopod, with terminal seta as long as exopod; endopod with three strong setae on inner margin, and micro-serrated terminal seta shorter than endopod.

Description of male ( figures 5 , 6). Integument glabrous, as in female. Carapace ( figure 5A ) 60% of entire body length; with obscure antennal notch. Antenna 1 ( figure 5B ) second article of peduncle with small tubercle with sensory seta; main fl agellum as long as third article of peduncle, accessory fl agellum with three reduced articles. Maxilliped 3 ( figure 5C ) ischium with inner tooth; merus with inner tooth (broken in described specimen) and two outer teeth (broken in described specimen); carpus with two outer teeth, dactylus with terminal setae longer than in female. Pereopod 1 ( figure 5D ) as in female. Pereopod 2 ( figure 5E ) with greater number of plumose setae than in female; dactylus with two plumose terminal setae. Pereopods 3 and 4 (figures 6A,B) with narrower proximal half of bases than in female. Exopods on maxilliped 3 and pereopods 1–4. Pereopods 4 and 5 (figures 6B,C) with progressively shorter bases and longer carpi compared to third pair. Uropod (figures 6D –F) with peduncle three times as long as last pleonite, 1.75 times as long as endopod; exopod shorter than endopod (one exopod half broken and one endopod broken in adult examined male, figure 6D), with plumose subterminal setae and plumose terminal setae shorter than exopod (broken in adult male); endopod with six (in immature male, two of them broken, figures 6E,F) or seven robust setae (in adult male, two broken, figure 6D) and micro-serrated terminal seta shorter than endopod (broken in adult male).

Remarks. Procampylaspis jonesi n. sp. resembles P. acanthomma Jones, 1984 , in maxilliped 2, pereopods 1 and 2, and the uropod, but diOEers in its shorter ocular lobe with no spines and the number of teeth on maxilliped 3. P. jonesi n. sp. also resembles P. arguini Bacescu and Muradian, 1972 , from the eastern Atlantic in its carapace and maxillipeds, but diOEers in its pereopods 1 and 2 and uropod. With P. bonnieri Calman, 1906 , from the Atlantic, it shares similar maxillipeds and uropod, and with P. compressa Zimmer, 1907 , from Antarctic waters, similar maxilliped 3, pereopod 2 and uropod (diOEers by carapace, pereopods— P. bonnieri and by carapace, maxillipeds 1, 2 and the rest of pereopods). This new species seems most closely related to P. acanthomma which has been recorded from both sides of the Atlantic ( table 1 ).

Figures

FIG. 3. Procampylaspis jonesi n. sp., female GANMNH Cum 153: (A) body, lateral view; (B) antenna 1; (C) labium; (D) mandible; (E) maxilla 2; (F) maxilla 1. Scales (in mm): (A): 1; (B): 0.2; (C–F): 0.1.

FIG. 4. Procampylaspis jonesi n. sp., female GANMNH Cum 153: (A) maxilliped 1; (B) maxilliped 2; (C) maxilliped 2 dactylus, magnified; (D) maxilliped 3; (E) pereopod 1; (F) pereopod 2; (G) pereopod 3; (H) pereopod 4; (I) pereopod 5; (J) uropod; (K) uropodal rami, magnified. Scales (in mm): (A): 0.1; (B, D, K): 0.2; (C): 0.1; (E–I): 0.25; (J): 0.5.

FIG. 5. Procampylaspis jonesi n. sp., male AMNH 18075: (A) body, lateral view; (B) antenna 1; (C) maxilliped 3; (D) pereopod 1; (E) pereopod 2. Scales (mm): (A): 1; (B, C): 0.2; (D, E): 0.3.

FIG. 6. Procampylaspis jonesi n. sp., male AMNH 18075: (A) pereopod 3; (B) pereopod 4; (C) pereopod 5; (D) uropod (adult male); (E) uropod (subadult male); (F) uropodal rami, magnified. Scales (in mm): (A–D): 0.3; (E): 0.5; (F): 0.2.