Typhloiulus insularis Strasser, 1938

Antić, Dragan Ž., Dražina, Tvrtko, Rađa, Tonći, Lučić, Luka R. & Makarov, Slobodan E., 2018, Review of the genus Typhloiulus Latzel, 1884 in the Dinaric region, with a description of four new species and the first description of the male of Typhloiulus insularis Strasser, 1938 (Diplop, Zootaxa 4455 (2), pp. 258-294: 263-264

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Typhloiulus insularis Strasser, 1938


Typhloiulus insularis Strasser, 1938 

Figs 5 View Figure , 6 View Figure , 18C View Figure

Material studied (total: 2 males, 1 female).

Topotypes : 1 male, CROATIA, Island of Cres , Beli , Petričevići, Čampari Pit (45.123881°N, 14.333628°E), 8 April 2001, R. Ozimec & B. Jalžić leg. (IZB)GoogleMaps  ; 1 male, same data except: 7 April 2012, T. Čuković leg. ( CBSS)GoogleMaps  ; 1 female, same data except: 20 October, 2000, R. Ozimec & B. Jalžić leg. ( CSBB)GoogleMaps  .

Type locality. CROATIA: Island of Cres, Čampari Pit.

Diagnosis. This species is most similar to some members of the subgenus Stygiiulus  , such as T. illyricus  , T. maximus Verhoeff, 1929  , and T. montellensis Verhoeff, 1930  (see Discussion). All these species are characterized by the presence of a stongly developed, fimbriated velum with an acuminate, posterior thickening. Typhloiulus insularis  differs clearly from these three species in the presence of a much smaller body and in certain details of gonopod structure, such as the presence of a more robust opisthomere without a posterior node and the presence of a well-developed, spoon-shaped mesomere.

Redescription. Based on topotypes (males) 10.5–12 mm long, vertical diameter of the largest body ring 0.55–0.65 mm, body with 36 or 43 podous rings + 1 or 2 apodous rings + telson. Topotype female 15.5 mm long, vertical diameter of the largest body ring 0.75 mm, body with 45 podous rings + 1 apodous ring + telson. Colouration: ( Figs 5A View Figure , 18C View Figure ). Depigmented, yellowish white. Head: ( Fig. 5B View Figure ). Labrum with three labral teeth, with 4 supralabral and 5+5 labral setae in smaller topotype male. Gnathochilarium with promentum kite-shaped, elongated; lamellae linguales with 2+2 setae in one row, stipites each with 3 setae. Antennae 1 mm long in smaller topotype male, its length 180% of vertical diameter of the largest body ring. Length of antennomeres I–VIII (in mm): 0.06 (I), 0.2 (II), 0.15 (III), 0.15 (IV), 0.2 (V), 0.13 (VI), 0.08 (VII), and 0.03 (VIII). Length/width ratio of antennomeres I–VII: 0.9 (I), 2.5 (II), 2 (III), 1.6 (IV), 1.8 (V), 1.3 (VI), and 1.3 (VII). Antennomeres V and VI each with a terminal corolla of large bacilliform sensilla; antennomere VII with a terminal corolla of microsetae. Body rings: ( Fig. 5C View Figure ). Barely visible metazonal longitudinal striations. Midbody rings with ca. 10 short metazonal setae. Length of midbody setae ca. 7% of vertical diameter of rings. Telson: ( Fig. 5E, F View Figure ). Epiproct with 2+2 dorsal and 6+6 ventro-lateral, long setae. Preanal process short, acuminate, with a small ventral protuberance and with two lateral setae. Paraprocts rounded, with numerous long setae. Hypoproct subrounded, with 1+1 long apical setae. Male legs: First pair of legs modified, hook-shaped ( Fig. 6A View Figure ); only three podomeres visible. Coxa without setae; prefemur each with two setae; femur, postfemur, and tibiotarsus coalesced, with two setae. Tips globular and tuberculate. Second pair of legs without ventral pads. Penis: ( Fig. 6B View Figure ). Bilobed. Lobes short, separated by a Vshaped sinus. Ventral margin of body ring 7: ( Fig. 5D View Figure ). Poorly-developed, subtrapezoid. Gonopods: ( Fig. 6C–E View Figure ). Promere (p) and mesomere (m) shorter than opisthomere (o). Promere (p) spatulate, shorter than m, mesal lobe (ml) high and wide, without setae; telopodite (t) small, globular. Mesomere (m) robust, spoon-shaped, with anterior corolla of denticles. Apical part of m covering apex of p in situ. Opisthomere (o) robust, characterized by the presence of a stongly developed, fimbriated velum (v) with an acuminate, posterior thickening. Mesally with one elongated spine. Solenomere (s) rather wide.

Distribution. Croatia: Island of Cres, Petričevići, Beli, Čampari Pit (type locality) ( Strasser 1938; present study). Up to now, this species was known only from its type locality ( Fig. 21 View Figure , red circle). This is the first record of the species after its original description, which was based on a female, and the first record of males.

Notes. Typhloiulus insularis  is known only from a pit.