Corallobolus cruentus Wesener & Enghoff & Sierwald 2009, sp. n.

Corallobolus cruentus Wesener, sp. n.

urn:lsid:zoobank.org:act: C4059969-8D03-4116-8D94-BF7937CFDCA3

Material examined: 1 ♂, 1 ♀, Holotype: 1 ♂ (86 mm long), FMMC 5397, Province Toliara, RNI Andohahela Parcel 1, camp 3, montane rainforest, 1200 m, 24°35.0’ S, 46°44.1’ E, leg. S. Goodman, pitfall trap, 7–17.XI.1995. Paratype: 1 ♀, FMMC 5397, same data as holotype.

Description. Measurements: male holotype with 46 body rings, circa 86 mm long, 7.5 mm wide. Female paratype with 44 body rings, 103 mm long, 10.0 mm wide.

Coloration contrasting blood-red/black (Fig. 1A). Head, antennae, legs and entire telson red. Mesozonites on body rings completely black, metazonites laterally black, dorsally blood red (Fig. 1B).

Head: each eye (ocellarium) with circa 38 ocelli arranged in 6 or 7 vertical rows (Fig. 1A). Labrum with standard three irregular teeth and a single row of 10–12 stout marginal setae. Clypeus with two setiferous foveolae on each side. Antennal cavity present, not extending below eye. Antennae of medium length, protruding back to ring 4. Relative lengths of antennomeres: 1<2>3=4=5=6, antennomere 2 only slightly longer than others. Terminal antennomere with four large sensory cones located together inside a membranous area (Fig. 3A). Antennomere 5 latero-apically with five rows (Fig. 3B), antennomere 6 with one or two rows (Fig. 3A) of sensilla basiconica.

Gnathochilarium: of usual Spirobolida shape (Fig. 3C). Lamellae linguales each with two standard setae located behind one another. Stipites each with three apical setae. Hypopharyngeal crest with a field of spine-like structures. Central pads of endochilarium separated into two levels, group of 8–10 sensilla located apically in recessed area (Fig. 3D). Medial palps with one large group of sensilla each, located towards hypopharyngeal crest.

Mandible: external tooth simple, rounded; mesal tooth with three cusps (Fig. 3E). Five pectinate lamellae. Mesal margin of pectinate area with four or five rows of small slender spines. Molar plate with numerous (10–12) transverse furrows.

Collum: smooth, laterally not protruding as far as ring 2 (Fig. 1A).

Body rings: dorsally mostly smooth, on mesozona with some irregular punctation. Metazona and mesozona ventrally with longitudinal impressions. Ozopores starting at body ring 6, located in front of, but not touching suture between mesozona and metazona. Ozopore on ring 6 located much more ventrally than subsequent ozopores.

Telson: anal valves with well-developed lips and micropunctation but with neither grooves, nor setae. Preanal ring sharp-edged and slightly protruding, but not extending beyond anal valves. Subanal scale inconspicuous (Fig. 1C).

Legs: coxae 1 and 2 elongated and fused with sternum, podomeres from prefemur to tarsus in both sexes each with 4–10 ventral/mesal setae (Fig. 1D). Length of midbody legs circa 1.3 times body diameter in males, circa 1.1 times body diameter in females. Each podomere with pair of apical, ventral setae. Coxae 3 and beyond of rectangular shape. Tarsus with a stout dorso-apical seta and a pair of stout ventro-apical ones in males, in females with three pairs of setae, of which apical pair stout, others successively much smaller.

Male sexual characters: tarsi 3 up to midbody legs with a tarsal pad not protruding past base of claw. Coxae 3–7 unmodified (Fig. 1B).

Anterior gonopod sternite elongated into a triangular process with a narrow tip (Fig. 2A). Mesal process of coxite slender and well-developed (Fig. 2A). Mesal process longer than sternite, but clearly shorter than telopodite. Telopodite with a large, wide, wellrounded process; retrorse projection large and well-rounded (Figs 1E, 2A).

Posterior gonopods unique (Figs 1F; 2B). Gonopod pair connected by a well-sclerotized sternite. Telopodites positioned parallel to one another (Fig. 1F). Coxite and telopodite in anterior view separated by a thin suture (Fig. 2C). Coxite simple, without processes (Fig. 1F). Telopodite large, coaxial with coxite (Fig. 1F). Telopodite completely sclerotized, wide, well-rounded, without a sharp edge or a process (Figs 1F, 2B, C). Telopodite on anterior side at mesal margin with thin, membranous folds (Fig. 1B). Lateral margin protruding higher than mesal margin. Sperm canal running along mesal margin of gonopod and discharging into short membranous folds below tip of telopodite (Fig. 1F).

Female sexual characters: vulva simple, bivalve-like (Figs 1D, 4). Both plates basally with 2–3 rows of setae (Fig. 4).

Etymology: cruentus, adjective, refers to the blood-spotted colour pattern.