Odontozona addaia Pretus, 1990

Grave, Sammy De & Anker, Arthur, 2024, The first records of Microprosthema pernambucensis (Bochini, Cunha, Terossi & Almeida, 2020) and Odontozona addaia Pretus, 1990 from the tropical eastern Atlantic (Decapoda: Stenopodidea), Zootaxa 5496 (3), pp. 429-440 : 436-437

Odontozona addaia Pretus, 1990

( Figs. 4 , 5d, f )

Odontozona addaia Pretus 1990: 343 , figs. 1–6.— Goy & Cardoso 2014: 565 (key).—Chevaldonné & Petrus 2021: 141, figs. 2–5.

Material examined. Republic of Cabo Verde, west coast of Sal Island : 1 female (pocl 3.5 mm), dive site Palmeira 3, depth 15 m, in crevice in rock wall of lava tube, leg. P. Wirtz, 14 Sept. 2021, RMNH. CRUS . D.59338; 1 female (pocl 4.1 mm), dive site Palmeira 3, depth 15 m, in crevice in rock wall of lava tube, leg. P. Wirtz, 14 Sept. 2021, RMNH. CRUS . D.59339; 1 ov. female (pocl 2.6 mm), dive site Palmeira 4, depth 14 m, in crevice in rock wall of lava tube, leg. P. Wirtz, 18 Sept. 2021, RMNH. CRUS . D.59340; 1 ov. female (pocl 2.4 mm), dive site Palmeira 4, depth 14 m, in crevice in rock wall of lava tube, leg. P. Wirtz, 18 Sept. 2021, RMNH. CRUS .D.59341.

Remarks. The present specimens closely adhere to the description of Odontozona addaia in Petrus (1990) and the species’ redescription in Chevaldonné & Pretus (2021). The following combination of morphological characters defines this species amongst Atlantic congeners: (1) posterior half of carapace sparsely dentate ( Fig. 4a ); (2) post-cervical groove with distinct dentate cincture ( Fig. 4a ); (3) pleura of third to fifth pleonites with medial teeth ( Fig. 4b ); and (4) third pereiopod propodus lacking rows of long setae on dorsal and ventral margins ( Fig. 4c ). Morphologically, the species appears to be most similar to the eastern Mediterranean O. minoica , from which it can be distinguished by a suite of morphological characters, as outlined in Chevaldonné & Pretus (2021: table 2).

The present four specimens from Cabo Verde exhibit a small amount of variation in carapacial dentition, as follows: cervical cincture with 5–6 teeth; post-cervical cincture with 8–13 teeth, sometimes medially interrupted; branchiostegal cincture with 5–10 teeth; area between cervical and post-cervical groove with 1–3 teeth, usually in two fields; posterior area with a dispersed field of 1–5 teeth; post-orbital area with 2–3 teeth; hepatic area with 3–4 teeth; and the pterygostomial angle with 1–4 small teeth ventrally, angle with 0–1 teeth + 1–2 teeth placed dorsally to the angle. Other variation observed was in the rostral formula (6/2–3), the number of teeth (7–8) in the serration of the uropodal exopod, and the number of teeth (8–10) on the dorsal transverse cincture on the sixth pleonite.

Colour pattern. The colour pattern of the specimens from Cabo Verde, when observed underwater ( Fig. 5d ), closely match that of the specimens from Marseille ( Chevaldonné & Pretus, 2021: fig. 2), with distinctive red banding of the pleon and orange-tinted pereiopods. The colour after the shrimps’ capture ( Fig. 5e, f ) is similar, with the colour of the pereiopods being more washed-out.

Distribution and ecology. The species was previously known from two locations in the Mediterranean Sea, a near-shore cave at a depth of 5 m, close to Port Addaia, Menorca, Balearic Islands, Spain ( Pretus 1990), and two caves at depths of 15–20 m in the Calanques near Marseille, France ( Chevaldonné & Pretus, 2021), about 380 km from the type locality. The present discovery of the species in Sal ( Cabo Verde), 3700 km (as the crow flies, but not the shrimp swims) from the type locality, considerably extends the previously known geographical range of the species into oceanic Atlantic waters. The habitat, in which the present specimens were found, is essentially the same as in the Mediterranean locations, and it is to be expected that over time the species will be recorded in other caves in-between these disjunct locations.

Figures

FIGURE 4. Odontozona addaia Pretus, 1990 from Sal, Cabo Verde; female (pocl 3.5 mm, RMNH.CRUS.D.59338); a) carapace, lateral; b) pleon, lateral; c) third pereiopod, mesial; d) same, chela, lateral.

FIGURE 5. Habitat and colour patterns of Microprosthema pernambucensis (Bochini, Cunha, Terossi & Almeida, 2020) (a–c) and Odontozona addai Pretus, 1990 (d–f), both from Sal, Cabo Verde; a), b) ovigerous female of M. pernambucensis in situ on lava tube wall; c) probably the same ovigerous female shortly after capture; d) ovigerous female of O. addaia in situ in a lava tube crevice; e) probably the same ovigerous female shortly after capture; f) another female (?) shortly after capture. Photographs by Peter Wirtz.