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Mizunotengus
Taxonomy
Mizunotengus was named by Karasawa et al. (2017). Its type is Mizunotengus makiguchimai.
It was assigned to Munidopsidae by Karasawa et al. (2017), Schweitzer et al. (2023).
It was assigned to Munidopsidae by Karasawa et al. (2017), Schweitzer et al. (2023).
Species
M. makiguchimai (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Mizunotengus Karasawa et al. p. 48 figs. Pl. 2–Pl. 11 |
| 2023 | Mizunotengus Schweitzer et al. p. 14 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Mizunotengus Karasawa et al. 2017
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†Mizunotengus makiguchimai Karasawa et al. 2017
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. Karasawa et al. 2017 | Moderate-sized munidopsid. Carapace, pyriform, slightly longer than wide, weakly vaulted transversely and longitudinally. Fronto-orbital margin about 40 percent of maximum carapace width. Rostrum long, acute, about 35 percent of maximum carapace length, gently downturned, with unarmed lateral margins and medial, dorsal keel extending onto carapace. Supraocular spine absent. Upper orbital margin concave, entire. Outer orbital spine long, needle-like, directed forward. Anterolateral spine much shorter than outer orbital margin, needle-like, directed forward. Lateral margin convex with forwardly directed spines; anterior three spines long, needle-like; fifth spine triangular; reminder of 6–7 lateral spines short, triangular, closely spaced. Posterior margin slightly concave. Dorsal surface finely tuberculate, without transverse ridge. Cervical groove well defined, sinuous. Cardiac region inverted triangular, separated from anterior branchial regions by rather deep posterior cervical groove. Branchiocardiac groove shallow. Branchial region with weak arcuate ridge parallel to lateral margin. Thoracic sternum broadly triangular, gently concave axially, with smooth surface. Sternites 3–7 fused, separated from one another by deep groove, bearing deep, axial, median groove. Sternite 3 small, subrectangular, about as long as wide, with posteriorly diverged lateral margin. Sternite 4 subhexagonal, wider than long, longest of all sternites; anterolateral margin concave; posterolateral margin nearly straight. Sternite 5–7 rectilinear, concave forward, much wider than long. Surfaces of pleonal somites 1–6, smooth or finely tuberculate dorsally; somite 1 narrow, reduced; terga of somites 2 and 3 with anterior transverse ridge; pleura of somites 2–5 well developed; tergum of somite 6 with shallow, longitudinal median groove; posterior margin convex; pleura of somite 6, much wider than long, diverging laterally, divided from tergum by rather deep groove converged distally. Telson tuberculate dorsally, consisting of several plates. Peduncle of uropod tuberculate dorsally. Eye small, oblique; eye stalk much longer than cornea without lateral eyespine. Basal article of antennule with strong dorsolateral and distolateral spines. Basal article of antennule with strong dorsolateral and distolateral spines. Basal article of antenna with sharp distolateral spine.
Pereiopod 1 chelate, long, slender, subcylindrical, about 3 times carapace length including rostrum. Dactylus and fixed finger thin, slender, about 40 percent propodus length, with finely serrated dorsal and occlusal margins; occlusal margins of both fingers not gaped; surface of palm, carpus, and merus sparsely covered with irregular-sized spines inclined anteriorly; dorsal, lateral, and ventral rows of spines present, mesial spines long, well developed; carpus about 40 percent propodus length; merus about 1.4 times longer than carpus, spines largest distally. Pereiopods 2–4 long, slender, flattened, ornamented with variably-sized spines, narrower than pereiopod 1; merus long, slender, with a medial row of short spines, flexor margin with long, sparsely arranged spines inclined distally and extensor margin with short spines directed distally. |
Measurements
No measurements are available
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| Source: f = family, o = order, c = class | |||||
| References: Aberhan 1992, Turnsek 1997, Fearon and Clapham 2023 | |||||
Age range: Early/Lower Miocene or 23.04000 to 15.98000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Miocene | Japan (Aichi) | M. makiguchimai (219248 219249) |