Dipteropeltis campanaformis Neethling, Malta & Avenant-Oldewage, 2014, n. sp
| Autor: | Neethling, Lourelle Alicia Martins, Malta, José Celso De Oliveira, Avenant-Oldewage, Annemariè |
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| Rok vydání: | 2014 |
| Předmět: | |
| DOI: | 10.5281/zenodo.6143744 |
| Popis: | Dipteropeltis campanaformis n. sp. (Figure 3 B, 4���6) Etymology. The species name campanaformis refers to the bell shape that the carapace lobes resemble. Type locality. In an unnamed forest stream (���Igarap�����, ��gua Branca) in Reserva Florestal Ducke, in the Amazonas River basin in Manaus, Amazonas, Brazil. Type host. Brycon amazonicus (Spix and Agassiz, 1829) Material examined. Holotype. Egg-bearing ♀ (INPA 1934, former INPA 423 iii, see Table 1) here designated. Paratypes. 6 egg-bearing ♀: 4 egg-bearing ♀ (INPA 423 i, ii, iv, v, see Table 1) collected from Brycon amazonicus (Spix and Agassiz, 1829) from an unnamed forest stream (���Igarap�����, ��gua Branca) in Reserva Florestal Ducke, in the Amazonas River basin in Manaus, Amazonas, Brazil, during July 1983; 2 egg-bearing ♀ (INPA 1755 i, ii, see Table 1) collected from an Acestrorhynchus sp.(Acestrorhynchidae) from the Padauari River, a left bank tributary of the upper Negro River, Amazonas, Brazil during October 1981. Description. In dorsal view (Fig. 4 A), this species has a narrow, square-shaped head shield that does not have folds nor does its width exceed the outer margins of the maxillules. Two compound eyes (ce) are visible. A pair of separate inter-ocular rods (ir) originates between the eyes, extends towards the nauplius eye (ne) and continues around it. The carapace lobes (HC, Fig. 3 B, 4 A���B, Table 2) are 13 mm long (range 8���16 mm, average 12.7 mm) with the split length of the carapace (CSL) at 78.46 % of the length of the carapace (CSL/HC, average 78.55 %, Table 2). The elliptical lobes give the parasite a bell shape and the lobes only shield the anterior part of the abdomen. The central duct of the midgut on the central axis of the lobes is visible in light microscopy with a network of tubules branching out. In ventral view (Fig. 3 B, 4 B); the head shield is cucullate and visible above the anterior margin of the maxillules (mx). There are two respiratory areas on the ventral side of each carapace lobe visible in scanning electron microscopy; the anterior area (ar, Fig. 4 B, 6 B) is a small (0.27 mm x 0.35 mm) triangular oval, while the posterior area (pr, Fig. 4 B, 6 C) is large and oval (1.31 mm x 2.97 mm). There are no hooks or spines. The total length of the specimen (HA) is 15 mm, with range between 10.00���20.00 mm (average 15.14 mm, see Table 2). The antennules and antennae (Fig. 5 A, 6 A) are obscured by the suckers. The antennule (ant) is small (64 ��m) and two segmented; the base is narrow and oval, the terminal segment cylindrical, with a blunt tip that carries five setae. The antenna (a, 135 ��m) is two segmented; the base is bulbous and oval; the terminal segment cylindrical, carrying four setae. The maxillules (mx, Fig. 4 B, 6 D) are cylindrical stalks with oval membranous suction discs that lack supportive rods (characteristic of Argulus and Chonopeltis). The cup rim is divided into three zones (Fig. 6 D); zone 1 (interior margin) bears prominent radiating rows of micro papillae (Fig. 6 E); zone 2 (middle) with suctorial plates (Fig. 6 F); zone 3 (exterior margin) with two rows of concentric elongated discoidal scales (Fig. 6 G). The sucker diameter (SD, Table 2) is 0.70 mm and constitutes a ratio of 0.05 (4.67 %) of the total length (SD/HA) of the specimen (range 0.03���0.07 mm, average 5.0 %). In the mouth (mo, Fig. 4 B, 6 H), the labrum (labr, upper lip) is an inverted U-shape with lateral protrusions (lp) and a single row of short setules (s, Fig. 6 I). The lateral protrusions form the base of the mandibles (m) which are sickle-shaped with 3 or 4 slim and sharp denticles at the distal end (Fig. 6 J). The labium (labi, lower lip) encircles the upper lip, making the mouth opening circular in shape. There are two short tubular labial spines (ls, 54 ��m) at the entrance to the mouth (Fig. 6 K). The internal dorsal surface of the mouth is densely packed with long setae (Fig. 6 L). The pre-oral structure (ps) is diminutive and triangular in shape, without a duct or spine (Fig. 6 M). The maxillae (ma, Fig. 4 B, 5 B) are prominent, conical, and directed vertically, forming a cubic shape in the head region. It is six-segmented; with a wide (segment 1, 727 ��m) base, tapering to the distal segment. Segments three and four bear round protrusions on their medial surfaces with pectinate scales (Fig. 6 N). Segment six bears two stout setule-like claws (Fig. 5 C). All the segments are sparsely covered by setae. The swimming legs are biramous. Leg 1 (Fig. 5 D), the precoxa (pc) is short (200 ��m), the coxa (cx) longer (488 ��m), the basopodite (bp, 250 ��m) bears the endopodite (en, 350 ��m) and the exopodite (ex, 600 ��m). Leg 2 (Fig. 5 E), the precoxa (pc) is short (166 ��m), the coxa (cx) longer (452 ��m), the basopodite (bp, 286 ��m) bears the two-segmented endopodite (en, 242 ��m) and the exopodite (ex, 362 ��m). Leg 3 (Fig. 5 F), the precoxa (pc) is short (182 ��m), the coxa (cx) is longer (484 ��m), the basopodite (bp. 348 ��m) bears the two-segmented endopodite (en, 302 ��m) and the exopodite (ex, 664 ��m). Leg 4 (Fig. 5 G), the precoxa (pc, 384 ��m) bears the bilobed natatory lobe (nl, 203 ��m) on the posterior surface, the coxa (cx) is longer (400 ��m); the basopodite (bp, 150 ��m) bears the twosegmented endopodite (en, 566 ��m) and the exopodite (ex, 566 ��m). All 4 legs bear round scales on the coxa and basopodite, with a denser concentration on the anterior surface. The abdomen (Fig. 3 B, 4 A, 4 B) has an angular base. Lobes (AL, Table 2) are 7 mm long (range 5���10 mm, average 7.21 mm) and lanceolate, with tips that bend slightly inwards. The abdomen has a ratio of 0.47 (46.67 %) of the length of the specimen (AL/HA, Table 2) with the species average at 47.80 %. Furcal rami were not observed at the position of the split. The average abdominal sinus (ASL) is 86.14 % of the length of the abdomen (ASL/AL, see Table 2). The spermathecae (sp, Fig. 4 B) are oval with angular anterior and posterior apices; the area is flattened and sparsely scattered with stout pectinate scales interspersed with setules (Fig. 6 O). Published as part of Neethling, Lourelle Alicia Martins, Malta, Jos�� Celso De Oliveira & Avenant-Oldewage, Annemari��, 2014, Additional morphological information on Dipteropeltis hirundo Calman, 1912, and a description of Dipteropeltis campanaformis n. sp. (Crustacea: Branchiura) from two characiform benthopelagic fish hosts from two Northern rivers of the Brazilian Amazon, pp. 179-193 in Zootaxa 3755 (2) on pages 185-188, DOI: 10.11646/zootaxa.3755.2.4, http://zenodo.org/record/230642 |
| Databáze: | OpenAIRE |
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