TABLE 1. Adult fossil decapod crustacean with internal soft tissues preserved except muscles for which we refer to Klompmaker et al. (2019: table 1).
| Internal structure(s) | Higher taxon | Species | Age | Locality | Reference |
| Gills | Brachyura | Archaeoplax signifera Stimpson, 1863 | Miocene | Gay Head, Massachusetts, USA | Cushman (1905) |
| Gills | Brachyura | Romaleon franciscae Robin et al., 2018 | Miocene | Kerguelen Islands | Robin et al. (2018) |
| Gills | Caridea | Bechleja brevirostris de Mazancourt et al., 2022 | Eocene (Lutetian) | Messel, Germany | de Mazancourt et al. (2022) |
| Gills | Brachyura | Secretanella sp. | Late Cretaceous (late Campanian) | Pennington County, South Dakota, USA | herein |
| Gills | Dendrobranchiata | Palaeobenthesicymus libanensis (Brocchi, 1875) | Late Cretaceous (late Santonian) | Sahel Alma, Lebanon | Audo and Charbonnier (2013) |
| Gills | Brachyura | Cretapsara athanata Luque et al., 2021 | Late Cretaceous (early Cenomanian) | Angbamo, Myanmar | Luque et al. (2021) |
| Gills | Brachyura | Marylyreidus punctatus Rathbun, 1935 | Early Cretaceous (Albian) | Fort Worth, Texas, USA | Franţescu et al. (2016) |
| Gills | Dendrobranchiata? | indet. | Middle Jurassic (Callovian) | La Voulte-sur-Rhône, France | Wilby et al. (1996) |
| Digestive tract (stomach and intestine) | Caridea | Bechleja brevirostris de Mazancourt et al., 2022 | Eocene (Lutetian) | Messel, Germany | de Mazancourt et al. (2022) |
| Digestive tract (intestine) | Astacidea | Aenigmastacus crandalli Feldmann et al., 2011 | Eocene (Ypresian) | McAbee, British Columbia, Canada | Feldmann et al. (2011) |
| Digestive tract (esophagus and cardiac stomach) | Brachyura | Secretanella sp. | Late Cretaceous (late Campanian) | Pennington County, South Dakota, USA | herein |
| Digestive tract (intestine) | Dendrobranchiata | Palaeobenthesicymus libanensis (Brocchi, 1875) | Late Cretaceous (late Santonian) | Sahel Alma, Lebanon | Audo and Charbonnier (2013) |
| Digestive tract (?stomach) | Dendrobranchiata | Cretapenaeus berberus Garassino et al., 2006 | Late Cretaceous (Cenomanian) | Djebel Oum Tkout, Morocco | Gueriau et al. (2014) |
| Digestive tract (intestine) | Paguroidea | Striadiogenes frigerioi Garassino et al., 2009 | Late Cretaceous (Cenomanian) | Hadjula, Lebanon | Garassino et al. (2009) |
| Digestive tract (intestine) | Axiidea | Cretacalliax levantina Pasini et al., 2020 | Late Cretaceous (Cenomanian) | Hadjula, Lebanon | Pasini et al. (2020) |
| Digestive tract (stomach) | Dendrobranchiata | Xiaopenaeus electrinus Xing et al., 2021 | Late Cretaceous (early Cenomanian) | Angbamo, Myanmar | Xing et al. (2021) |
| Digestive tract (intestine) | Glypheidea | ?Mecochirus sp. | Late Jurassic (early Tithonian) | Causse Méjean, France | Moreau et al. (2022) |
| Digestive tract (stomach) | Dendrobranchiata? | indet. | Middle Jurassic (Callovian) | La Voulte-sur-Rhône, France | Wilby et al. (1996) |
| Digestive tract (cardiac and pyloric stomachs, intestine) | Polychelida | Voulteryon parvulus Audo et al., 2014 | Middle Jurassic (Callovian) | La Voulte-sur-Rhône, France | Jauvion et al. (2016) |
| Digestive tract (cardiac and pyloric stomachs, hepatopancreas) | Polychelida | Palaeopolycheles nantosueltae Jauvion et al., 2020b | Middle Jurassic (Callovian) | La Voulte-sur-Rhône, France | Jauvion et al. (2020b) |
| Digestive tract (indet.) | Polychelida | Willemoesiocaris ovalis (Van Straelen, 1923) | Middle Jurassic (Callovian) | La Voulte-sur-Rhône, France | Audo et al. (2014) |
| Reproductive organs (ovaries) | Caridea | Bechleja brevirostris de Mazancourt et al., 2022 | Eocene (Lutetian) | Messel, Germany | de Mazancourt et al. (2022) |
| Reproductive organs (ovary) | Polychelida | Voulteryon parvulus Audo et al., 2014 | Middle Jurassic (Callovian) | La Voulte-sur-Rhône, France | Jauvion et al. (2016) |
| Nerve chords | Dendrobranchiata | Xiaopenaeus electrinus Xing et al., 2021 | Late Cretaceous (early Cenomanian) | Angbamo, Myanmar | Xing et al. (2021) |
| Nerve chord (ventral) | Dendrobranchiata? | indet. | Middle Jurassic (Callovian) | La Voulte-sur-Rhône, France | Wilby et al. (1996) |
| Heart | Dendrobranchiata? | indet. | Middle Jurassic (Callovian) | La Voulte-sur-Rhône, France | Wilby et al. (1996) |
