Copidognathus humerosus
Creators: name: Durucan, Furkan
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Halacaridae
Copidognathus
Copidognathus humerosus

description: Copidognathus humerosus (Trouessart, 1896) (Figs. 8A–G, 11H–M, Table 3)
Redescription – Measurements presented in Table 3.
Morphology and notes
Male – All dorsal and ventral plates well developed and divided by narrow bands of densely striated cuticle and the plates with distinctly raised porose areolae with canaliculi (Figs. 8A, B). AD wider than long; anterior margin with small frontal lamella. AD has one large areolae in the middle AD has one large middle areolae with about 30–35 pores. Dorsal setae small. Pair of ds-1 on AD posterior to pair of glp-1; ds- 2 in anteromedial margin of OC. Posterior end of OC pointed and extending to level of leg III. Raised areolae with 10–12 rosette pores. OC with two corneae; longer than wide. Gland pores small. Pore canaliculus slightly posterior to gland pore. Ds-3 below anterior margin of PD, ds-4 and ds-5 at 0.42 and 0.65 of its total length, respectively. Pair of ds-6 on anal cone. PD longer than wide, has only one pair of medial costae. Each costae one to four rosette pores wide. Eleven panels between two raised costae. Gland pores small, one pair immediately lateral to costae at about the level of insertion of leg IV.
AE with seven long setae (40–50) and a pair of epimeral pores. Epimeral II has two setae instead of one. Epimeral processes I and II are large and lamellar. Posterior margin of AE straight. PE anteriad extending to the level of gland pores, posteriad almost to the level of middle of GO. PE with one dorsolateral and three ventral setae. PE with canaliculi arranged in groups. Genitoanal plate with 20 pgs surrounding genital opening. Each genital sclerite bears four sgs (2:2 grouped) (Fig. 8B).
Gnathosoma (Fig. 8C) 1.66 times longer than wide. Gnathosomal base with pair of distinct areolae. One pair of maxillary setae on gnathosomal base, other pair half-way along rostrum. Rostrum triangular. Tectum truncate, Rostrum as long as 0.54 of gnathosomal length. Palps are slender and consist of four segments. P1 to P4 lengths 20, 53, 15, 60 respectively. P1 and P3 without setae, P2 with single seta, P4 with three setae at basal whorl. P4 longer than P2.
All legs (Figs. 8D–G) slender and long but shorter than idiosoma. Leg I to leg IV lengths 341, 316, 380, 336, respectively. Telofemora, genua and tibiae with articular membranes; those of tibiae distinctly triangular and pointed. Surface of telofemora, genua and tibiae I and II foveate. Leg chaetotaxy from trochanter to tarsus (bipectinated setae between parentheses, parambulacral setae and solenidia excluded): leg I: 1, 2, 5, 4, 7(2), 65; leg II: 1, 2, 5, 4, 7(2), 3; leg III: 1, 2, 3, 3, 5(1), 3?; leg IV: 0, 2, 3, 3, 5(1), 4. Telofemura I to IV 3.33, 3.46, 3.33 and 3.4 times longer than high. Tibiae I to IV with 2, 2, 1, 1 bipectinate setae. Tarsi I to IV with 3, 3, 4?, 43 dorsal setae and 3, 0, 0, 0 ventral setae. All legs with two lateral claws with accessory process. All claws with pecten and number of pecten tines between 20-22 (oil immersion needed) and a small bidentate median claw.
Protonymph – Dorsal and ventral plates and porose areolae on plates less developed than adults (Fig 11H, I). AD with middle areolae and glp-1 near to ds-1. OC longer than wide. Ds-1 on porose areaolae on AD. Pairs of ds-2 and ds-3 on striated integument. Ds-4 and ds-5 on PD. Ds-6 on anal cone. AE with three setae and pair of epimeral pore. GP rounded with a pair of genital acetabula and patterns as shown with arrow on Figure 11I. Gnathosoma longer than wide (Fig. 11J). Solenidion on tarsi I almost 20 long. Leg chaetotaxy from trochanter to tarsus (bipectinated setae between parentheses, parambulacral setae and solenidia excluded): leg I: 1, 2, 3, 4, 5(1), 6; leg II: 1, 2, 3, 4, 4(1), 3; leg III: 1, 2, 2, 3, 5(1), 4; leg IV: 0, 1+2 (basifemur + telofemur), 3, 5(1), 3. Each of tibiae I to IV with one bipectinate setae. All legs with two lateral claws with accessory process but large pectines (oil immersion) and a small bidentate median claw.
Larva – AD with pair of gland pores anterior to pair of ds-1; posterior margin truncate (Fig. 11L). Both pairs of OC more rounded than adults and protonymphs, PD and anal cone fused. Ventral side of the specimen was torned therefore not illustrated. Leg III long (195) five-segmented. Basifemura and telofemora III fused. Leg chaetotaxy from trochanter to tarsus (bipectinated setae between parentheses, parambulacral setae and solenidia excluded): leg I: 1, 4, 4, 5(1), 3?; leg II: 1, 4, 4, 5(1), 3; leg III: 1, 3, 3, 5, 4; Tibiae I to III with 1, 1, 0 bipectinate setae. Tarsi I to III with 3, 3, 4 dorsal setae and 3?, 0, 0 ventral setae. All legs with two long lateral claws with delicate accessory process and a bidentate median claw (Fig. 11M).
Remarks – Copidognathus humerosus was originally described by Trouessart (1896) from the French Mediterranean (Marseille, Bay of La Ciotat) at a depth of approximately 45 m depth, and from the French Atlantic (Brest) at 1–5 m depths. Later, Bartsch (1979) also reported the species from the French Atlantic (Roscoff). In this study, the species is recorded for the first time from Fethiye, Muğla (Türkiye, Levantine Sea). The external morphological characteristics of the specimens (male, protonymphs, and larva) are consistent with those from the French coasts.
description: Published as part of Durucan, Furkan, 2024, Three new records and some juveniles of the genus Copidognathus (Acari, Halacaridae) from Türkiye, pp. 771-796 in Persian Journal of Acarology 13 on pages 776-777, DOI: 10.22073/pja.v13i4.85812, http://zenodo.org/record/14668778