Caucaseuma strasseri Antić, 2022
Antić, Dragan & Makarov, Slobodan, 2022, Review of the genus Caucaseuma Strasser, 1970, with the description of a new cavernicolous species from the Western Caucasus and an updated key and distribution (Diplopoda, Chordeumatida, Anthroleucosomatidae), European Journal of Taxonomy 819 (1), pp. 90-107 : 93-100
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|Caucaseuma strasseri Antić|
Caucaseuma strasseri Antić sp. nov.
Caucaseuma strasseri Antić sp. nov. is the only species in the genus characterized by the presence of anterior triangular processes on the angiocoxites of the anterior gonopods.
The new species is named after the late Carlo Strasser (1903–1981), a well-known and always inspiring diplopodologist, who made an immeasurable contribution to the knowledge of European millipedes. At the same time, Strasser described the first cave chordeumatidan taxon from the Caucasus, Caucaseuma lohmanderi . A noun in the genitive case.
Material examined (7 ♂♂, 4 ♀♀, 30 juvs)
Holotype RUSSIA • ♂; Western Caucasus, Krasnodar Province, Greater Sochi, near Lazarevskoye, Kirovskaya (= Tigrovaya) Cave ; 2 May–12 Aug. 1996; A.G. Koval leg.; Barber pitfall traps; ZMUM.
Paratypes RUSSIA • 1 ♂ (used for SEM); same collection data as for holotype; NHMW MY10260 • 4 ♂♂ (2 without posterior body rings); same collection data as for holotype; ZMUM • 1 ♂ (without posterior body rings); same collection data as for holotype; IZB • 1 ♀; same collection data as for holotype; ZMUM .
RUSSIA • 2 ♀♀ (without posterior body rings); same collection data as for holotype; IZB • 1 ♀ (without posterior body rings); same collection data as for holotype; ZMUM • 30 juvs (12 without posterior body rings); same collection data as for holotype; IZB .
SIZE AND NUMBER OF BODY RINGS. Body in adults with 30 rings (including telson). Holotype male 20 mm long, vertical diameter of largest ring 1.35 mm. Paratype males 16.5–17 mm long, vertical diameter of largest ring 1.3 mm. Paratype female 18.5 mm long, vertical diameter of largest ring 1.6 mm.
HEAD ( Figs 2B–C View Fig , 3A–E View Fig ). Setose, frontal side convex in both sexes. Labrum with three medial teeth and 4+4 or 6+6 labral and 2+2 supralabral setae ( Fig. 3B View Fig ). Promentum triangular, without setae. Lingual plates with 6+7 setae arranged in irregular row. Stipites with ca 30 setae each. Antennae 3.1 mm long in holotype male. Length of antennomeres (in mm): I (0.11), II (0.30), III (0.88), IV (0.43), V (0.85), VI (0.30), VII (0.22) and VIII (0.04). Length/breadth ratios of antennomeres I–VII: I (1), II (2), III (7), IV (3), V (6), VI (2) and VII (2). Antennomeres II, IV, V, VI and VII with one, three, one, four and one sensillum trichoideum, respectively ( Figs 2B View Fig , 3A View Fig ). Antennomeres V and VI distally with sensilla basiconica ( Fig. 3D–E View Fig ). Lateral to antennal sockets a group of papillae-like outgrowths present ( Fig. 3C View Fig ). Number of ommatidia: 20–25 (mainly 23) in 6 rows in both sexes, arranged in irregular subtriangle ( Figs 2C View Fig , 3C View Fig ).
COLLUM. Narrower than head, with six macrochaetae, as all body rings. Anterior edge semi-circular, posterior margin gently concave.
BODY RINGS ( Figs 2A–B, D–E View Fig , 3G–H View Fig ). Lateral keels well-developed. Macrochaetae long and trichoid ( Fig. 4E–F View Fig ). CIX (ring 15) ~ 0.7; MIX (ring 15) ~ 1.2; PIX (ring 15) = 0.6; MA (ring 15) ~ 105°. Prozonites with hexagonal tiles. Metazonites with scale-like structures.
TELSON ( Fig. 2E View Fig ). Epiproct with a pair of spinnerets and 3+3 setae (1+1 paramedian, 2+2 marginal). Hypoproct with 1+1 distal setae. Paraprocts with 3+3 marginal setae.
MALE SEXUAL CHARACTERS ( Figs 2B View Fig , 4 View Fig ). Leg-pair 2 with genital openings on coxae ( Fig. 4B View Fig ). Leg-pairs 3–7 enlarged. Leg-pairs 3 and 4 each with a basal external protrusion on prefemur ( Fig. 4C–D View Fig ). Legpairs 5 and 6 without peculiarities ( Fig. 4E–F View Fig ). Leg-pair 7 with ventral side of coxae densely setose, with a shallow excavation posteriorly; ventral side of prefemora densely tuberculated; tarsi elongated ( Fig. 4G View Fig ). Leg-pairs 10 and 11 with coxal sacks; no other peculiarities ( Fig. 4H–I View Fig ).
ANTERIOR GONOPODS ( Figs 5A–C View Fig , 6A–F View Fig , 7H View Fig ). Gonopodal sternum (S) well-developed, wide, with anterior triangular, long sternal process (Sp) covered with hair-like outgrowths. Anterior parts (aA) of angiocoxites shield-like, medially completely fused, only with anterior furrow, almost fully rounded in anterior view; subdistally with a pair of notches and short, lateral, bone-like processes (bp); distally with medial structure mushroom-shaped in anterior view with lateral margins curved posteriad; posteriorly, at site of fusion of anterior parts of angiocoxites, with a posterior projection (pp), denticulate distally, and extending between posterior parts of angiocoxites. A pair of characteristic anterior triangular (tp) processes present on angiocoxites. Posterior parts (pA) of angiocoxites in form of elongate levers in posterior view, with distal parts curved anteriad; anteriorly with additional lamellar and setose projections. Between posterior parts of angiocoxites coxal vesicles (Cv) visible.
POSTERIOR GONOPODS ( Figs 5E View Fig , 6G–I View Fig ). Gonopodal sternum (S) well-developed, wide, with a deep pit laterally. Coxites (Cx) divided, each with a small telopodite (T) posteriorly and coxal vesicle (Cv) and angiocoxite (A) anteriorly. A pair of flagelliform processes originating from base of angiocoxite.
This species is known only from a cave and shows certain troglobiomorphic features such as reduced body and ommatidia pigmentation, elongated antennae and walking legs, as well as a larger and more robust body compared to epigean congeners.
Caucaseuma strasseri Antić sp. nov. is known so far only from its type locality, Kirovskaya (= Tigrovaya) Cave ( Fig. 1 View Fig ). This cave is the type locality of two more cave animals, viz., the troglobiontic isopod Pseudobuddelundiella ljovuschkini Borutzky,1967 and the stygobitic copepod Speocyclops psezuapsensis Borutzky, 1965 ( Turbanov et al. 2016a).
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