Isotomurus matanicus Shayanmehr, Yoosefi & Zamani, 2024

Zamani Khormandichali, Fatemeh, Shayanmehr, Masoumeh, Yoosefi Lafooraki, Elham & Mohammadi Sharif, Mahmoud, 2024, Springtails (Hexapoda, Collembola) of Savadkuh (Mazandaran) with the description of a new species of Isotomurus Börner (Entomobryomorpha, Isotomidae), Journal of Insect Biodiversity and Systematics 10 (1), pp. 59-72 : 66

Isotomurus matanicus Shayanmehr, Yoosefi & Zamani sp. nov. ( Figs 3E, 4A–4E)

https://zoobank.org/ urn:lsid:zoobank.org:act:6134EBFD-44A3-4232-B28F-9DBE82BE42A5

Type material. Holotype: Iran, Mazandaran province, Savadkuh region, Zirab, Matankola , forest, soil and leaf litter, 36°09'28.54'' N, 53°00'03.81'' E, 597 m a.s.l., 13.IV.2022, leg. FZK ; Paratypes: Mazandaran province, Savadkuh region, Zirab, Matankola , forest, soil and leaf litter, 36°09'21.85'' N, 53°00'01.51'' E, 644 m a.s.l., 13.IV.2022, 3 specimens, leg. FZK .

Description. Body shape as it is for the genus; Background colour light brown. Body with a dark brown dorsomedial band on Th. II-Abd. V, without lateral bands or patches. Dorsomedial band rather wide and interrupted on Abd. IV. Posterior part of head with large black medial spot. Central part of head and bases of antennae pigmented ( Fig. 3E). Antennae and legs dark, furca paler ( Fig. 3E). 8+8 Omma. PAO elliptical, 0.76 times as long as the nearest Omma. Maxillary outer lobe with 4 sublobal hairs and bifurcate palp. Labrum with 4 pre-labral setae, labral edge as common for the genus, with four sharp ridges and ventro-apical ciliation. Labium with 6 basomedian, ~ 8 proximal, 4 basolateral setae ( Fig. 4A). Antennae about 1.88 as long as head diagonal. With rather few s-setae on three first antennal segments. Ant. IV with a subapical pin seta and some short blunt lateral sensilla. Body covered with smooth setae of unequal length, 3,3,1 Trich. on Abd. II, III, and IV, and Mac. with multilateral ciliation. Legs with normal claws. Claw Without inner tooth, with lateral and outer teeth ( Fig. 4B). Empodial appendage without inner tooth. Ret. with 4+4 teeth and 6–7 setae ( Fig. 4C). VT with 3+3 laterodistal and many anterior and posterior setae. Manubrium densely covered by mesosetae. Manubrial thickening is simple, without teeth in the medial part. Dens are rather slender, continuously narrowed, with a sparse cover of dorsal setae, in basal 1/3 only. One of posterior setae in basal part slightly longer than others. Posterior side of dens crenulated, wrinkles regular in distal half and more disordered in basal half ( Fig. 4D). Mucro with four teeth and without setae, apical tooth small ( Fig. 4E). Ratio manubrium: dens: mucro as 20: 44.4: 1. Ratio of mucro to outer edge of claw III as 0.34. Modified male setae on Abd. III and IV absent.

Etymology. The name reflects the type locality (Matankola forest).

Ecology. It is usually found in broad-leaf forests in leaf litter and soil.

Diagnosis. Isotomurus matanicus sp. nov. belongs to the group of species without a seta on mucro, with 3,3,1 Trich. on Abd. II, III, and IV, and with 3+3 laterodistal setae on VT. The main differences between I. matanicus sp. nov. and these species are summarized in Table 1. The new species resembles I. afghanicus Yosii, 1963 by having a dorsomedial band and not having lateral spots and bands. The differences between them are in dorsomedial band (on Th. II–Abd. IV in I. afghanicus and on Th. II-Abd. V in I. matanicus sp. nov.), the number of setae on Ret. (10 setae in I. afghanicus and 6 in I. matanicus sp. nov.) and manubrial thickening (multidentate in I. afghanicus and simple in I. matanicus sp. nov.). The new species is closely related to I. pseudopalustris Carapelli, Frati, Fanciulli & Dallai 2001 which can be separated by the number of setae on Ret. (10–18 in I. pseudopalustris against 6–7 in I. matanicus sp. nov.). The new species is close to I. unifasciatus (Börner, 1901) which has modified male setae on Abd. III and IV (absent in I. matanicus sp. nov.). Also, they can be separated by the number of setae on Ret. (10–25 in I. unifasciatus against 6–7 in I. matanicus sp. nov.). I. matanicus sp. nov. is close to I. potapovi Yoosefi Lafooraki & Shayanmehr, 2023 which can be distinguished by dorsomedial band (indistinct in I. potapovi and dark and rather wide in I. matanicus sp. nov.).